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 1. 풀이


node.js를 대신해서 c++ 환경에서 rest api를 활용하는 방법을 찾아보았다.


다양한 방법이 존재하는데, cpprestSDK를 활용해보았다.


이 코드를 실행하기 위해서 cpprestSDK와 boost library의 설치가 필요하다.

이 설치는 https://upglay.tistory.com/12 을 참고하여 진행하였다.



 2. 소스코드


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#include <iostream>
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
#include <cpprest/uri.h>
#include <cpprest/json.h>
 
 
 //#include <json/json.h>
 
using namespace utility;
using namespace web;
using namespace web::http;
using namespace web::http::client;
using namespace concurrency::streams;
 
auto GET_print_to_json() {    
    // Create a file stream to write the received file into it.
    auto fileStream = std::make_shared<ostream>();
 
    // Open stream to output file.
    pplx::task<void> requestTask = fstream::open_ostream(U("users.json"))
 
        // Make a GET request.
        .then([=](ostream outFile) {
        *fileStream = outFile;
 
        // Create http_client to send the request.
        http_client client(U("https://reqres.in"));
 
        // Build request URI and start the request.
        return client.request(methods::GET, uri_builder(U("api")).append_path(U("users")).to_string());
    })
 
        // Get the response.
        .then([=](http_response response) {
        // Check the status code.
        if (response.status_code() != 200) {
            throw std::runtime_error("Returned " + std::to_string(response.status_code()));
        }
 
        // Write the response body to file stream.
        response.body().read_to_end(fileStream->streambuf()).wait();
        std::wcout << "\n\n========json 출력 완료=========\n\n"
            << response.body() << std::endl;
        // Close the file.
        return fileStream->close();
    });
 
    return requestTask;
}
 
auto GET_request() {
    // Make a GET request.
    auto requestJson = http_client(U("https://reqres.in"))
        .request(methods::GET,
            uri_builder(U("api")).append_path(U("users")).append_query(U("id"), 1).to_string())
 
        // Get the response.
        .then([](http_response response) {
        // Check the status code.
        if (response.status_code() != 200) {
            throw std::runtime_error("Returned " + std::to_string(response.status_code()));
        }
 
        // Convert the response body to JSON object.
        return response.extract_json();
    })
 
        // Get the data field.
        .then([](json::value jsonObject) {
        return jsonObject[U("data")];
    })
        // Parse the user details.
        .then([](json::value jsonObject) {
 
        std::wcout << "그냥 테스트  " << uri_builder(U("api")).append_path(U("users")).append_path(U("hi")).append_query(U("id"), 1).append_query(U("name"), 2).to_string() << std::endl
            << "\n==Get request 확인==\n"
            << "first_name:" << jsonObject[U("first_name")].as_string()
            << "    last_name:" << jsonObject[U("last_name")].as_string()
            << "    id:" << jsonObject[U("id")].as_integer() << std::endl;
    });
 
    return requestJson;
}
 
auto POST_request() {
    // Create user data as JSON object and make POST request.
    auto postJson = pplx::create_task([]() {
        json::value jsonObject;
        jsonObject[U("first_name")] = json::value::string(U("atakan"));
        jsonObject[U("last_name")] = json::value::string(U("sarioglu"));
 
        return http_client(U("https://reqres.in"))
            .request(methods::POST,
                uri_builder(U("api")).append_path(U("users")).to_string(),
                jsonObject.serialize(), U("application/json"));
    })
 
        // Get the response.
        .then([](http_response response) {
        // Check the status code.
        if (response.status_code() != 201) {
            throw std::runtime_error("Returned " + std::to_string(response.status_code()));
        }
 
        // Convert the response body to JSON object.
        return response.extract_json();
    })
 
        // Parse the user details.
        .then([](json::value jsonObject) {
        std::wcout << "\n==POST request 확인==\n"
            << jsonObject[U("first_name")].as_string()
            << " " << jsonObject[U("last_name")].as_string()
            << " (" << jsonObject[U("id")].as_string() << ") \n"
            << jsonObject.to_string()
            << std::endl;
    });
 
    return postJson;
}
 
auto PUT_request() {
    // Make PUT request with {"name": "atakan", "location": "istanbul"} data.
    auto putJson = http_client(U("https://reqres.in"))
        .request(methods::PUT,
            uri_builder(U("api")).append_path(U("users")).append_path(U("1")).to_string(),
            U("{\"name\": \"atakan\", \"location\": \"istanbul\"}"),
            U("application/json"))
 
        // Get the response.
        .then([](http_response response) {
        if (response.status_code() != 200) {
            throw std::runtime_error("Returned " + std::to_string(response.status_code()));
        }
 
        // Convert the response body to JSON object.
        return response.extract_json();
    })
 
        // Parse the user details.
        .then([](json::value jsonObject) {
        std::wcout << "\n==PUT request 확인==\n"
            << jsonObject[U("name")].as_string()
            << "    " << jsonObject[U("location")].as_string() << "  \n"
            << jsonObject.to_string()
            << std::endl;
    });
 
    return putJson;
}
 
auto PATCH_request() {
    // Make PATCH request with {"name": "sarioglu"} data.
    auto patchJson = http_client(U("https://reqres.in"))
        .request(methods::PATCH,
            uri_builder(U("api")).append_path(U("users")).append_path(U("1")).to_string(),
            U("{\"name\": \"sarioglu\"}"),
            U("application/json"))
 
        // Get the response.
        .then([](http_response response) {
        if (response.status_code() != 200) {
            throw std::runtime_error("Returned " + std::to_string(response.status_code()));
        }
 
        // Print the response body.
        std::wcout << "\n==PATCH request 확인==\n"
            << response.extract_json().get().serialize() << "  1 \n"
            //<< response.extract_json().get().to_string() << "  2 \n"
            << response.to_string()
            << std::endl;
    });
 
    return patchJson;
}
 
auto DEL_request() {
    // Make DEL request.
    auto deleteJson = http_client(U("https://reqres.in"))
        .request(methods::DEL,
            uri_builder(U("api")).append_path(U("users")).append_path(U("1")).to_string())
        // Get the response.
        .then([](http_response response) {
        std::wcout << "\n==DEL request 확인==\n"
            << "Deleted: " << std::boolalpha << (response.status_code() == 204) << "\n"
            << response.to_string()
            << std::endl;
    });
 
    return deleteJson;
}
 
int main() {
    auto requestTask = GET_print_to_json();
    auto requestJson = GET_request();
    auto postJson = POST_request();
    auto putJson = PUT_request();
    auto patchJson = PATCH_request();
    auto deleteJson = DEL_request();
 
    // Wait for the concurrent tasks to finish.
    try {
        requestJson.wait();
        postJson.wait();
        putJson.wait();
        patchJson.wait();
        deleteJson.wait();
        while (!requestTask.is_done()) { std::cout << "."; }
    }
    catch (const std::exception &e) {
        printf("Error exception:%s\n", e.what());
    }
 
    return 0;
}
cs



 3. 참고


http://www.atakansarioglu.com/easy-quick-start-cplusplus-rest-client-example-cpprest-tutorial/



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